How to separate the power lines and signal lines of the I/O module?

In I/O module systems, effectively separating power lines from signal lines is a fundamental principle for preventing strong interference coupling. Physically, they should be laid separately using independent cable trays, trunking, or conduits. If they must be laid along the same path, sufficient spacing must be maintained; a minimum spacing of 30 cm is generally recommended, increasing with higher voltage and current. When power and signal lines inevitably cross, they should cross perpendicularly at a 90-degree angle. Inside the cabinet, power and signal terminal blocks should be installed in separate areas, with a gap in between or separated by metal partitions. Avoid bundling power and signal cables in the same harness. In situations where safe spacing cannot be met, signal lines can be run through metal conduits or double-shielded cables can be used, with proper grounding of the conduits. The routing paths for power and signal lines should be clearly marked on the layout diagram during the design phase. After installation, the separation effect can be verified by measuring the induced voltage on the signal lines or observing the system's stability during the start-up and shutdown of power equipment.